Nuclear obscuration and scattering in Seyfert 2 galaxies
نویسندگان
چکیده
منابع مشابه
Nuclear obscuration and scattering in Seyfert 2 galaxies
We study the relation between gaseous absorbing column density (NH), infrared colors and detectability of the broad lines in a large sample of Seyfert 2 galaxies(Sy2s). We confirm that Sy2s without polarized broad lines tend to have cooler 60μm/25μm colors; this correlation was previously ascribed to the effect of obscuration towards the nuclear region. We find some evidence that Sy2s without p...
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We build a large sample of Seyfert 2 galaxies (Sy2s) with both optical spec-tropolarimetric and X-ray data available, in which 41 Sy2s with the detection of polarized broad emission line (PBL) and 32 without. We found that for luminous Sy2s (with L 2−10keV > 10 42 erg s −1), most (92%) of the Compton-thin sources show PBL, while only 53% Compton-thick sources do. Our results, for the first time...
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We report the BeppoSAX detection of a hard X-ray excess in the X-ray spectrum of the classical high-ionization Seyfert 2 galaxy Tol 0109–383. The X-ray emission of this source observed below 7 keV is dominated by reflection from both cold and ionized gas, as seen in the ASCA data. The excess hard X-ray emission is presumably due to the central source absorbed by an optically thick obscuring tor...
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We have observed a sample of Seyfert (Sy) galaxies with the global Very Long Baseline Interferometry (VLBI) to test the predictions of the unification scheme for the Sy galaxies which hypothesises that Sys of Type 1 and of Type 2 constitute a single population of objects. If Sy 1 and Sy 2 galaxies differ only in the orientation of the axisymmmetric active nucleus with respect to the observer, t...
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Active galaxies are often associated with starbursts, which are possible sources of fuelling for the nuclear black holes. By means of optical (3500 − 7500 Å) spectroscopic and narrow-band photometric data (Hα + [NII]λ6548,6583 and [OIII]λ5007) it is possible to detect starburst features in active nuclei and to study the correlation with Seyfert type and the surrounding environment. Here we pres...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20000302